Sewing machine



P. P. RUHE AND W. A. SONEN.

SEWING MACHINE.

APPLICATION FILED DEC-3h 1920.

IN VENTORS fiw/L fi lTuHE W/Lumfi'. 0NEN v I r ATTORNEY 4 SHEETS-SHEET l- Patented Feb. 7, 1922.

P. P. RUHE AND W. AQSONEN.

SEWING MACHINE.

APPLICATION FILED 02cm. 1920. 1 ,4;Q5,443. Patented Feb. 7, 1922.

x S 4 SHEETSSHEET 2.

IN VEN TOR5 %I%,MM450NEN M ATTORNEY P. P. RUHE AND W. A. SONEN.

SEWING MACHINE. APPLICATION man 050.311 1 920.

1,405,443. Patented Feb. 7, 1 922.

4 SHEETS-SHEET 3.

VENTORS A TTORNE Y P. P. RUHE AND W. A. SONEN.

SEWING MACHINE.

APPLICATION FILED DEC. 3l-| 1920.

v Patented Feb.7,1922.

4 SHEETS-SHEET 4.

INVENTORS fflul. f? RUHE WIL L IHM ,4 N N M ATTORNEY IAUL r. RUHE, or HOIBOKEN, NEW JERSEY, AND ILLIAM A. sonnn, on NEW YORK, N. Y. Y I

SEWING MAoHInE.

Specification of Letters Patent.

Application filed December 31, 1920. Serial No. 434,280.

To all whom it may concern:

'Be it known that we, PAUL' P. Bonn and WILLIAM A. SoNnN, both citizens of the United States, and residents, respectively, of Hoboken, inv the county of Hudson and State of New Jersey, and Bronx, New York, have invented certain new and useful Improvements in Sewing Machines, of which the following is a specification.

This invention relates to sewing machines of the type known as overseaming machines, such as are commonly used in sewing'furs and the like.

One of the objects of the invention is to improve the mechanism for operating the looper. Another object is to provide a looper mechanism which can be operated at a high rate of speed with a very small amount of wear. Another object is to provide means for quickly making adjustments to compensate for wear on the various parts of'the looper mechanism. Another object is to provide mechanism for securing the neoessary movements of the looper without resorting to the use of slots for guiding the looper in its movements.

A further object is to provide an improved mechanism for intermittently feed- 'ing the work being sewed. A still further ob ect is to combine and co-ordinate the variousinstrumentalities herein described so as to efiectively perform the functions set forth. Other objects will be apparent'from the following description when read in con neotion with the accompanying drawings in which Fig. l'is a plan view of a machine embodylng our invention, the'top plate being sectioned off in the interest of clearness;

Fig. 2 is a longitudinal section on the staggered line 22 of Fig. 1;

Fig. 3 is a transverse section on the line 3-3 of Fig.1; I Fig. 4 is a skeleton view substantially on line H of Fig. 3 showing the looper actuating mechanism; :Fig. 5 is a detail view showing the mechanism for actuating the feed wheels intermittently;

Figs. 6 and 7 are dia rammatic views showing two different positions of the looper and needle in the act of forming a stitch.

Referring to the drawings, the main drive shaft 1 is mounted in suitable bearings 2 and 3 in'the frame a of the machine. This shaft is driven bya pulley 5 connected by means of a belt,not shown, to any suitable source of, power. An eccentric 6 secured to Patented Feb. 7, 19 22.

the main drive shaftZoperates between the downwardly extending arms 7 and 8 of a yoke 9 carried loy-the needle bar 10. The lower end of the arm 8 is notched out at 11 for -co-action with a fixed guide pin12. The needle bar is guided in the usual man ner through openings '13: and 14: formed in the end walls '15 and 16 of the supporting frame. A sultable head 17 is clamped or otherwise secured to the forward end of. the needle bar '10 and carries a needle 18. Z.

"For operating the loopenwe employ two eccentrlcs, one adapted to produce the reclproeatory movement necessary to carry the loop of thread'from one side of the' wor'k to the other side, and-the-otheriadapted to move the looper vertically toward'and away from the needle. We also. provide a fioat-' ing support'in which the looperispivotally mounted so that it can be swung laterallyprises an intermediate yoke-shaped member 19 having downwardly extending arms" 20 and 21 between which an eccentric 22,"secured to the'shaft*-1,,operates to move, the

looper back and forth 'in's ubs'tantially the same direction of travel as the needle. cured to the forward part ofthe intermediate member'l9 is a tubular guide 23 and to the rear portion of the intermediate memher is a similar tubular guide '24. 1 The i lo is provided with'the usual curved end 28 having a hook 29 formed on the end thereof for engagement with the thread. 3 l

- Lateral extensions 30 are formed onthe tubular member 23' and engaged by pivot screws 31 secured in the outer ends of a yoke-like 1ink 32 forming one-halfoffa'toggle 33,-thefother half .of'which is formed by links Zia-secured to a shaft 35fcarrying I screw "39 said fitting is carried onpivot screws 40 adjustably mounted in links 41 and provided with suitable jam nuts to lock them in place. The links 41 are carried by a shaft 42 journalled on pivot screws 43 secured in the main frame of the machine. These pivot screws also have the jam nuts to lock them in their adjusted positions.

As thus constructed it is apparent that as the eccentric 22 revolves the intermediate member 19 will be moved back and forth and carry the looper with it. During this movement the rear end of the floating frame which is supported on the links 41 will. move in a, true arcuate path and will be raised and lowered a slight distance as the link passes to and from the vertical dead center. It is necessary to give the looper a greater vertical movement than that obtainable by such a simple link. And this greater movement is obtained by utilizing the toggle 33, above described, which is actuated by the eccentric 38. As this eccentric rotates it straightens out the toggle to raise the looper and then breaks the toggle to again lower said looper to bring its hooked end 29 low enough to engage the looped thread adjacent to the end of the needle.

Heretofore such a raising and lowering movement has been secured by utilizing a cam slot with a roller carried by the looper frame, and in practice this has been found decidedly objectionable due-to the excessive wear and noisy operation. As the shaft rotates and the'toggle 83 is straightened out the whole floating frame pivots about the screws 40 and raises the hooked end of the looper 29 to the maximum-height required and this vertical stroke can be readily va- I'ied by adjusting the member 24 longitudinally in the fitting 39 and securing it by means of the set screw 39. When the parts become worn in use it is a simple matter to 7 take up such wear by adjusting the pivot screws 31, 30, 43, etc.

For swinging the hooked end 29 of the looper laterally across the path of travel of the needle, we employ a crowned cam roller 44 carried on an arm 45 secured to the looper 25 adjacent to the rear arm 21 of the intermediate supporting member. This roller runs in a cam groove '46 formed in a cam 47 carried by the main drive shaft 1.

The operation of the parts thus far described is as follows. Starting with the needle ,in its rearward position. as shown in Figs. 2 and 4 as the shaft 1 rotates clockwise the eccentric 6 will advance the needle and the looper hook 28 will first move upwardly a short'distance drawing the loop with it and then will be moved downwardly by the action of the eccentric 38 and toggle So as to bring. the loop to the position shown in Fig. 6 in which the needle is'about to pass through theloop. The needle will continue forw rd through the-100p a d t e work is fed along by the feed wheels 48 and t 49, the former being freely mounted on a bracket 50 and the latter being secured to a shaft 51 carrying a worm gear 52 which meshes with a feed worm 53 loosely mounted on a short shaft 54 which is fixed in a bracket 55 carried by the mainframe of the machine. A disc 56 is secured to the worm 53 and adapted to drive it intermittently. This disc has a peripheral flange 57 which is engaged by the notched end 58 ofa friction shoe 59. The inner end 60 of this shoe coacts with a shoulder 61 formed on a lever 62 which is oscillated by a rocking arm 63 mounted loosely on an'adjustable stud 64 secured to the frame of the machine by a wing nut 65. The rocking arm isprovided with a slot 66 to permit slight longitudinal play relatively to the stud 64. An eccentric strap 67 actuated by an eccentric 68 carried on the main shaft 1 serves to rock the arm 63.

Fixed on the shaft 54 is a clutch member 69 having'inclined surfaces 70. The disc 57 isprovided with an annular groove 71 and engagement with the inclined walls 70 and said grooveto prevent the backward rotation of the disc 57.

When the eccentric 68 lifts the strap 67 it will rock the arm '63 about the stud 64 and. also move it longitudinally a short distance and impart a downward rockingmovement to the lever'62. This will raise the shoulder 61 and cause the shoe59 to grip the flange 57 and move the disc in the direction of the arrow 00 shown in Fig. 5, the clutch balls at this time slipping along the inclined faces of the fixed memberfif). When the eccentric makes its downward stroke and, rocks the arm 63 in the opposite direction, the lever 62 will be moved upwardly and a spring 74, secured at one end to the shoe, and on the other end to a pin 75 carried by the lever 62, will cause the shoe to bepulled back freely on the flange 57, the balls 72 at this time preventing the movement of the disc. The

stud 64 passes through a slot 64 inthemain closed. Various modifications thereof in detail and in arrangement of parts and the substitution of mechanical equivalents may be made by those skilled in the art without departing from the invention as defined in the following claims.

What we claim is: 1. An overseamlng sewing machine 1ncludin a'reci rocatin needle a 100 er and a floating support comprising front and rear end members for pivotally carrying said looper and an intermediate yoke secured to said end members, means co-acting with said yoke to reciprocate the floating support, links arranged to move in anarcuate path pivotally secured to oneof said end members, toggle links operatively engaging the other of said end members, and means for moving said toggle links to move the looper toward and away from the needle.

2. An overseaming sewing machine in-; cluding a reciprocating needle, a looper and a floating support comprising front and rear 7 end members for pivotally carrying said looper and an'intermediate yoke secured to said end members,- means co-acting with said yoke to reciprocate the floating support, linksarranged to move in an arcuate path pivotally secured to one of said end members, toggle links operatively engaging the other of said end members and means for moving said toggle linksto move the looper towardand away from the needle and means for rocking said looper to swing it across l the path of travel of the needle;

In witness whereof, we have hereunto signed our names.

PAUL P. RUHE. WILLIAM A. SONEN. 

